HT13R90 datasheet(6/18 Pages) HOLTEK

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HT13R90

Rev. 1.10

July 10, 2007

· Mode 0

- OMOD option bits set to 00

At power on, after the power on procedure has com-

pleted, the device will keep running continuously as

long as the RESET line remains at a high level. If the

RESET line should go low, the oscillator will stop and

the LED0 pad will change to an inactive state. The de-

vice will then enter the standby state. Any time the

RESET line goes low, the device will enter the standby

state until the RESET line again goes high.

This mode is usually used for periodic turn on and turn

off time setting applications.

The LED0 pad output signal timing and state machine

is shown below.

Output Timing Diagram for OMOD = 0,0

R E S E T

R u n n i n g S t a t e

A c t i v e

I n a c t i v e

N o t e :

L E D 0 ( O A C T = 1 )

L E D 0 ( O A C T = 0 )

T 1 B

T 1 A

T 1 B

F o r E v e r y

L E D 1 / 2 A c t i v e S t a t e

( N e x t B l o c k )

T 1 A = ( 2 5 6 - T M R 1 A ) x ( 1 / f T M R 1 )

T 1 B = ( 2 5 6 - T M R 1 B ) x ( 1 / f T M R 1 )

L E D 1 / 2

( L x O U T = 0 0 , L x A C T = 1 )

L E D 1 / 2

( L x O U T = 0 1 , L x A C T = 1 )

L E D 1 / 2

( L x O U T = 1 0 , L x A C T = 1 )

L E D 1 / 2

( L x O U T = 1 1 , L x A C T = 1 )

L E D 1 / 2

( L x O U T = 0 0 , L x A C T = 0 )

L E D 1 / 2

( L x O U T = 0 1 , L x A C T = 0 )

L E D 1 / 2

( L x O U T = 1 0 , L x A C T = 0 )

L E D 1 / 2

( L x O U T = 1 1 , L x A C T = 0 )

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